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Author Topic: Digico 192 kHz console causing 192.6mHz carrier.  (Read 6272 times)

Jason Glass

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #10 on: October 09, 2016, 11:44:42 pm »

Pete's antenna is about 10' above and over from the front of the Digico rack. When I did near field measurements I could get -70dBm about a foot away from the rear of the engine.

Ouch.  Perhaps it might be a good idea for RF guys to start instituting a "Clock LO" zone with a 192.605 assignment in our advance coordinations.  Hmm.  Henry, Pete, Ike, and Vinny, what do you think?
« Last Edit: October 10, 2016, 11:56:48 am by Jason Glass »
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Henry Cohen

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #11 on: October 10, 2016, 11:55:40 am »

Ouch.  Perhaps it might be a good idea for RF guys to start instituting a "Clock LO" zone with a 196.605 assignment in our advance coordinations.  Hmm.  Henry, Pete, Ike, and Vinny, what do you think?

I always have at least an "NFG" zone and many times a zone for house/venue and/or video wall spurs.
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Henry Cohen

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Pete Erskine

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #12 on: October 10, 2016, 10:34:19 pm »

Digico's can't run 192kHz, only 48 and 96 kHz :-)

It will run at 192kHz although for the life of me I can't imagine why you would want to.
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Neil White

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #13 on: October 11, 2016, 01:46:11 am »

It will run at 192kHz although for the life of me I can't imagine why you would want to.

It's interesting that this is in the Digico Sd-Rack for I/O. It is very common for us to have a large quantity of these (sometimes 8+) all located together with our active splits and RF world on our biggest shows. I assume there would be a cumulative effect for multiple racks. Is the same spur also measurable near the actual processing engine in the surface of the consoles?
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Ike Zimbel

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #14 on: October 11, 2016, 08:20:44 pm »

Ouch.  Perhaps it might be a good idea for RF guys to start instituting a "Clock LO" zone with a 192.605 assignment in our advance coordinations.  Hmm.  Henry, Pete, Ike, and Vinny, what do you think?
I'm in. Absolutely...going into my next coord. It's worth it just to keep a RadCom belt pack from ending up on that frequency.
iz
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~Ike Zimbel~
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Jens Palm Bacher

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #15 on: October 13, 2016, 03:03:05 pm »

It's interesting that this is in the Digico Sd-Rack for I/O. It is very common for us to have a large quantity of these (sometimes 8+) all located together with our active splits and RF world on our biggest shows. I assume there would be a cumulative effect for multiple racks. Is the same spur also measurable near the actual processing engine in the surface of the consoles?
As long as your performers and receive antennas are not there, i would not worry too much. Compared to LED/movinhead emission on the stage itself, this is a very minor issue in my experience.
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Ike Zimbel

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #16 on: November 02, 2016, 10:31:31 am »

I'm in. Absolutely...going into my next coord. It's worth it just to keep a RadCom belt pack from ending up on that frequency.
iz
Further to this: I took some measurements on my most recent show, and this signal is definitely present around the processing engines. I measured the DigiDesign stage and FOH racks and a Calrec Hydra i/o. Can't remember if I got close enough to the Yamaha traffic mixer (a 5D, I think) to measure it or not. It's definitely there, even if I had to go looking for it with a high gain antenna and my TTI gain wide-open. One thing that I checked, and this is very good news, is that it's NOT coming from switch-mode power supplies. I would say that this is a very low level source of potential interference.
That said, for the time it takes to plug in as an "avoid" frequency in a coordination it's worth doing. Easier to avoid it than spend the time chasing it on a job.
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~Ike Zimbel~
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Keith Broughton

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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #17 on: November 02, 2016, 11:39:04 am »

Good to know.
Thanks for the confirmation test Ike :)
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Re: Digico 192 kHz console causing 192.6mHz carrier.
« Reply #17 on: November 02, 2016, 11:39:04 am »


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